Lib/test/test_import.py

   1 from test_support import TESTFN, TestFailed
   2
   3 import os
   4 import random
   5 import sys
   6
   7 # Brief digression to test that import is case-sensitive:  if we got this
   8 # far, we know for sure that "random" exists.
   9 try:
  10     import RAnDoM
  11 except ImportError:
  12     pass
  13 else:
  14     raise TestFailed("import of RAnDoM should have failed (case mismatch)")
  15
  16 # Another brief digression to test the accuracy of manifest float constants.
  17 import double_const  # don't blink -- that *was* the test
  18
  19 sys.path.insert(0, os.curdir)
  20
  21 source = TESTFN + ".py"
  22 pyc = TESTFN + ".pyc"
  23 pyo = TESTFN + ".pyo"
  24
  25 f = open(source, "w")
  26 print >> f, "# This will test Python's ability to import a .py file"
  27 a = random.randrange(1000)
  28 b = random.randrange(1000)
  29 print >> f, "a =", a
  30 print >> f, "b =", b
  31 f.close()
  32
  33 try:
  34     try:
  35         mod = __import__(TESTFN)
  36     except ImportError, err:
  37         raise ValueError, "import from .py failed: %s" % err
  38
  39     if mod.a != a or mod.b != b:
  40         print a, "!=", mod.a
  41         print b, "!=", mod.b
  42         raise ValueError, "module loaded (%s) but contents invalid" % mod
  43 finally:
  44     os.unlink(source)
  45
  46 try:
  47     try:
  48         reload(mod)
  49     except ImportError, err:
  50         raise ValueError, "import from .pyc/.pyo failed: %s" % err
  51 finally:
  52     try:
  53         os.unlink(pyc)
  54     except os.error:
  55         pass
  56     try:
  57         os.unlink(pyo)
  58     except os.error:
  59         pass
  60
  61 del sys.path[0]